Bolt-anchor.



PATENTED SEPT. 13, 1904.

H. B. NEWHALL.

BOLT ANCHOR.

Nirnn STATES Patented. September 13, 1904.

HENRY B. NEWHALL, OF PLAINFIELD, NEW JERSEY.

BOLT-ANCHOR.

SPECIFICATION forming part of Letters Patent N0. 770,022, datedSeptember 13, 1904.

Application filed April 11, 1903. Serial No. 152,106. (No model.)

T0 at whom, it may concern:

Be it known that I, HENRY B. NEWHALL, a citizen of the United States,and a resident of Plainfield, in the county of Union and State of NewJersey, have invented certain new and useful Improvements inBolt-Anchors, of which the following is a specification, reference beinghad to the accompanying drawings, which form a part of the same.

This invention relates to bolt-anchors or expansion-shields such as areused to secure bolts or screws to masonry or other material.

In the accompanying drawings, in which the same reference-numerals referto similar parts in the several figures, Figure 1 is a side view of amember of an expansion-shield embodying this invention. Fig. 2 is an endview of such shield. Fig. 3 is a side view of a member of anexpansion-shield, illustrating a modified construction. Fig. 4 is atransverse sectional view of such a shield.

Expansion-shields embodying this invention may be formed of any desirednumber of members suitably joined in any desired way for propercooperation to allow for the relative movement of the parts of theshield in engaging the material in which the shield is used. The shieldsmay be constructed of any suitable material, and malleable iron or othermetal may be used, if desired.

In the embodiment of this invention inclicated in Figs. 1 and 2 theshield members 1 and 2 are indicated as provided with rows of grippingprojections 7 and 8 on the outside of the same, which serve to morefirmly grip the material in which the shield is used, and, furthermore,since these projections are preferably arranged in longitudinal rowsdiscontinuous longitudinal ribs are formed in this way, which preventthe rotation of the shield members after they have been inserted in thematerial byforcibly driving them into the hole or otherwise. Theexterior of the shield members may, however, be formed in other ways tocooperate with the material in which the shield is used, if desired.Suitable alining means are preferably provided to maintain the propercooperation of the shield members during the operation of the same. Ifdesired, suitable alining-lugs, such as 6, may

be formed upon the members which hold the several members in properlongitudinal and lateral alinement by engaging cooperating depressions.such as the recesses between the gripping projections 7 in the othermembers. The shield members are preferably formed with severablesections which allow for the ready adjustment of the size and shape ofthe shield to adapt it to the particular purpose desired. The shieldmembers are indicated as being formed with severable shield-sections14:, these sections being firmly united to the main-portion of theshield members by weakened con nections, so as to properly cooperatetherewith. This may be accomplished in any desired way, and in thedrawings the severable sections are shown as united together and asjoined to the main shield members by the yokes or necks 15, thebreaking-slots 12 and 13 being formed at these points. The severablesections are indicated as joined longitudinally to the shield at theouter end of the same, into which the bolt is inserted, although it isof course understood that these severable sections may be otherwisejoined to the shield to alter its size and shape and may, if desired, beattached to the inner end of the shield. In this way severable sectionsof the shield members may be formed integral by casting or otherwise,the size of the reduced yokes being such that the severable sections maybe readily removed, so

that the length of the shield may be regulated to suit the diiferentconditions under which it is used. If the shield is formed of suchmaterial as malleable iron, the severable sections may be readilyremoved by breaking them from the shield by a hammer or otherwise, theyokes being severed in this way.

Any desired means may be employed for expanding the shield members andforcing them into contact with the material in which the shield isinserted. If desired, the shield members may be formed-with athreadedhole, which is preferably tapered, as indicated, and the thread 3 may begiven such form and size as to properly cooperate with the bolt or screwwith which the shield is to be used. This thread may extend throughoutthe length of the shield, as indicated in Fig. 3, or the shield may, ifdesired, be formed with an unthreaded portion adjacent one end, which isadapted to act as a bushing and to receive the unthreaded shank of thebolt inserted in the shield. It is not necessary in all cases to employthe alining-lugs which have been described, since any other desiredmeans may be used to properly hold the parts of the shield in alinementwhile they are being used. In Fig. 3 a suitable alining-ring 9 isindicated, which grips the shield members and fitting within suitabledepressions or grooves therein holds them together in such a way thatthey cooperate properly. A similar alining-ring, if desired, may be usedin connection with the alining means indicated in Fig. 1.

It is of course understood by those familiar with this art that manychanges may be made in the form, proportions, and numbers of parts ofthis device without departing from the spirit of this invention.Furthermore, certain features of this device may be employed withoutusing all of the same and may be used in connection with other deviceswithout losing the advantages of this invention. I do not, therefore,desire to be limited to the disclosure which has been made in this case;

What is claimed as new, and what it is desired to secure by LettersPatent, is set forth in the appended claims:

1. In v expansionshields, shield members formed with alining means, withgripping projections and with a tapering threaded hole for expanding thesame, said sections being formed with an enlarged unthreaded hole at oneend of the same to form a bushing, said members being formed withintegral severable sections joined longitudinally thereto by reducedyokes to allow the ready disconnection of said severable sections.

2. In expansion shields, shield members having a tapering threaded holeto be engaged by a bolt, alining-lugs and depressions in said members tomaintain alinement of the same, there being rows of gripping projectionson said members, said members being formed with severable sectionsjoined longitudinally thereto by integral yokes, there beingbreaking-slots between said several sections to allow the readydisconnection of the same.

3. In expansion shields, shield members formed with means to cooperatedirectly with a fastening member inserted into said shield members andthereby expand the same, said shield members comprising detachablesections normally joined by weakened connections to said members toallow the ready removal of said sections.

4:. 1n expansionshields, shield members comprising longitudinal sectionsjoined by reduced severable yokes.

5. In expansion shields, shield members comprising detachable sectionsnormally joined by weakened connections to said members to allow theready removal of the said HENRY B. NEWHALL.

sections.

